粉煤灰中氧化铁对软土地基的加固作用

为了强化氧化铁在加固土体中的数量，采用高掺量的粉煤灰对软土地基进行了加固处理，从微观角度对加固后土体中的氧化铁进行了研究。加固后土体中氧化铁呈胶体状态存在于颗粒之间，使颗粒间的连接力增强；且对土体中的游离氧化铁含量的测定也表明，粉煤灰的加入使土体中的游离氧化铁含量增加，也证明了氧化铁对土体的加固作用。在理论上可以预见，利用高含量氧化铁的粉煤灰进行软土地基加固会有较为理想的效果。

Function of Ferric Oxide of Fly Ash in Soft Soil Foundation Consolidation

To increase the ferric oxide content in consolidated soil, higher amount of fly ash was used in the consolidation of soft soil foundation. Microscopic study was then made on the ferric oxide in the consolidated soil foundation. It was found that the ferric oxide was in a colloid state, thus strengthening the binding force among grains. The measurement of the free ferric oxide content in the soil also indicated that the addition of fly ash into the soil foundation increased the free ferric oxide content, which too, verified the strengthening function of ferric oxide. It can be foreseen theoretically that the fly ash that has high content of ferric oxide, when used in soft soil foundation consolidation, will achieve ideal effect.